Size Name:OM-M4/3 Features: This lens mount adapter is mainly used for connecting the "OM Classic Manual Lens" to "cameras with Micro 4/3 Mount". Completely manual control, manual focus and manual exposure. There is no electrical connection on the ring so diaphragm control of the lens is set manually. It allows focus to infinity. Install, remove and operate lens smoothly. Smooth surface smooth surface for effortless mount, fine made to be light weight and strong. Designed for Panasonic G1 G2 G3 G5 GH1 GH2 GH3 GF1 GF2 GF3 GF5 GF6 GX1 GX2; for Olympus E-P1 E-P2 E-P3 E-P5 E-PL1 E-PL2 E-PL3 EPL5 EM-P1 EM-P2 EMD and new models. Specifications: Material: Metal Compatible lens: for OM Classic Manual Lens Compatible cameras: for Micro 4/3 Mount camera Front mount: for OM Classic mount Rear mount: for Micro 4/3 Mount Item size: 6 6 3cm / 2.6 2.6 1.0in Item weight: 74g / 2.6oz